Monitoring of concrete segregation using AC impedance spectroscopy
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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11
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Construction and Building Materials, Volume 384
Abstract
Segregation is one of the major phenomena decreasing the durability of concrete and increasing its risk of failure. This paper investigates the feasibility of AC Impedance Spectroscopy (ACIS) to serve as a monitoring technique for the concrete segregation during compaction. The impedances of fresh concrete were determined between compaction intervals. Changes in the calculated bulk resistivities were compared to hardened densities of the drilled cores, as well as to aggregate segregation obtained via digital image analysis of the hardened concrete sections. During the compaction process, a significant difference in the bulk resistivity was observed between the top and bottom parts of segregated specimens in comparison to unsegregated specimens. By inspecting the relationship between the measurement methods, it was found that ACIS provides a reliable approach (r=-0.948) for estimating the segregation level in cases where the resistivity is mostly affected by the movement of aggregates.Description
Funding Information: This study was financially supported by Co-operation agreement with the Finnish concrete industry (project number 700721) and the Academy of Finland (Finnish Centre of Excellence in Inverse Modelling and Imaging, project number 336795). Publisher Copyright: © 2023 The Authors
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Ojala, T, Ahmed, H, Kuusela, P, Seppänen, A & Punkki, J 2023, 'Monitoring of concrete segregation using AC impedance spectroscopy', Construction and Building Materials, vol. 384, 131453. https://doi.org/10.1016/j.conbuildmat.2023.131453